China UltraFine Ultrafine Sic Marble Powder Making. Ultrafine Vertical Roller Mill are suitable for huge capacity producing, widely used in grinding non-flammable and non-explosive materials under 7the Mohs hardness, such as quartz, feldspar, calcite, talcum, barite, fluorite, iron ore, copper ore quartz, especially for slag, cement clinker, zircon sand, fly ash and carborundum, coal, etc.